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Wyszukujesz frazę "Asadi, H." wg kryterium: Autor

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    Wyświetlanie 1-7 z 7
    Tytuł:
    Long-term effects of land use on soil aggregate stability
    Autorzy:
    Abrishamkesh, S.
    Gorji, M.
    Asadi, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/26589.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    land use
    aggregate stability
    soil erosion
    slope position
    humid climate
    soil aggregate
    long-term effect
    Iran
    forest
    pasture
    Źródło:
    International Agrophysics; 2011, 25, 2
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of erosion and tillage on the productivity and quality of selected semiarid soils of Iran
    Autorzy:
    Mehdizade, B.
    Asadi, H.
    Shabanpour, M.
    Ghadiri, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/26049.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Opis:
    This greenhouse research was carried out to study the effects of water and tillage erosion on agricultural productivity and soil quality in soil samples from a semiarid region of Iran. A factorial experiment of complete randomized block design was used to compare the effects of soil erosion (eroded and non-eroded soils), slope position, water stress and fertilizer (N-P-K) on yield and yield components of wheat as soil productivity index. The results showed that erosion ie water and tillage erosion has a significant effect (p<0.01) in decreasing soil productivity due to its negative impact on soil organic matter, nutrients (N and K) and hydraulic conductivity. Complete N-P-K fertilization and water stress had significant effects on increasing and decreasing of wheat yield, respectively. The effect of water stress in particular was so high that it could eclipse the erosion impact on yield reduction. Wheat dry matter and grain mass on foot and mid slopes were significantly higher than that on upslope positions where total N and available K were the lowest and equivalent calcium carbonate the highest. Saturated hydraulic conductivity and total nitrogen were found to be the most important soil properties as far as their correlations to wheat yield are concerned.
    Źródło:
    International Agrophysics; 2013, 27, 3
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Frequency study of functionally graded multilayer graphene platelet-reinforced polymer cylindrical panels
    Autorzy:
    Farsadi, T.
    Asadi, D.
    Kurtaran, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/38629566.pdf
    Data publikacji:
    2021
    Wydawca:
    Instytut Podstawowych Problemów Techniki PAN
    Tematy:
    graphene platelet-reinforced polymer
    cylindrical panels
    nonlinear frequency
    Opis:
    In this study, nonlinear fundamental natural frequencies of Functionally Graded (FG) multilayer Graphene Platelet-reinforced Polymer Composite (GPL-RPC) curved cylindrical panels are studied. It is considered that the Graphene Platelet (GPL) nanofillers are distributed in the matrix either uniformly or nonuniformly along the thickness direction. Four GPL distribution patterns namely, UD, FG-O, FG-X, and FG-A are considered. The effective material properties of GPL-RPC layers are obtained via the modified Halpin–Tsai micromechanics model and the rule of the mixture. A nonlinear structural model is utilized based on the virtual work principle. Green’s nonlinear kinematic strain relations are used to account for the geometric nonlinearities and the First-order Shear Deformation Theory (FSDT) is adopted to generalize the formulation for the case of moderately thick cylindrical panels including transverse shear deformations. The Generalized Differential Quadrature (GDQ) method of solution is employed to solve the nonlinear governing equations of motion. The present study aims to study the effect of GPL weight fraction for the proposed distribution patterns on the nonlinear fundamental frequency of functionally graded GPL-RPC cylindrical panels with different boundary conditions.
    Źródło:
    Archives of Mechanics; 2021, 73, 5-6; 471-498
    0373-2029
    Pojawia się w:
    Archives of Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical properties and flexural behaviour of reinforced concrete beams containing recycled concrete aggregate
    Autorzy:
    Dawood, Malak H.
    Al-Asadi, Ali K.
    Powiązania:
    https://bibliotekanauki.pl/articles/36054761.pdf
    Data publikacji:
    2022
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    normal aggregate
    NA
    recycled concrete aggregate
    RCA
    reinforced concrete
    RC
    interfacial transition zone
    ITZ
    Opis:
    Increasing waste recycling has become an essential process in the construction industry due to the environmental and economic advantages, such as minimizing waste in landfills, saving natural resources, and decreasing pollution. Crushing and sieving waste from standard compression test cubes is used to produce the recycled concrete aggregate (RCA). A set of standard concrete cylinders, cubes, and beam specimens were made by utilizing coarse aggregate replacement ratios of 0%, 30%, 50% and 70%. At the day 28 stage, the specimens were tested to determine compressive strength, stress–strain relationship, splitting tensile strength, and flexural strength. In addition, four reinforced concrete (RC) beams were cast and tested under a four-point load to evaluate the flexural behaviour of RC beams with partial replacement of the natural aggregate with RCA. One was a natural aggregate (NA) control beam, while the others had varying RCA ratios (30%, 50% and 70%). The results show that the compressive strength of RCA concrete with the replacement by 30%, 50% and 70% decreased by 9.10%, 18.88% and 22.57% respectively, in comparison to the compressive strength of normal concrete (NC). The RCA concrete showed a high strain capacity, which indicated high ductility. The maximum RCA type strains ranged from 0.0056 to 0.0072. Concrete flexural strength showed a slight decrease in comparison to NC (18.83% decrease), where the tensile strength showed a 10.61% decrease in comparison to NC. As for RC beams, the load-carrying capacity decreased by 10.5% with increases in the replacement ratio.
    Źródło:
    Scientific Review Engineering and Environmental Sciences; 2022, 31, 4; 259-269
    1732-9353
    Pojawia się w:
    Scientific Review Engineering and Environmental Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Removal of hexavalent chromium from aqueous solution by adsorption on γ-alumina nanoparticles
    Autorzy:
    Golestanifar, H.
    Haibati, B.
    Amini, H.
    Dehghani, M. H.
    Asadi, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/207945.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    adsorption
    alumina
    aluminum
    chemicals removal
    water treatment
    chromium
    chromium compounds
    nanoparticles
    sorption
    alumina nanoparticles
    hexavalent chromium
    adsorpcja
    aluminium
    usuwanie chemikaliów
    uzdatnianie wody
    chrom
    związki chromu
    nanocząstki
    sorpcja
    nanocząstki tlenku glinu
    chrom sześciowartościowy
    Opis:
    The use of γ-alumina (γ-Al2O3) nanoparticles as adsorbent to remove Cr(VI) from aqueous solution was investigated using batch experiments. Adsorption experiments were carried out for various initial doses of Al2O3, initial concentrations of chromium(VI), contact times and pH. The structure and morphology of the sorbent was characterized by XRD, SEM, and TEM techniques. Results demonstrated that the removal efficiency of chromium(VI) was increased by increasing the contact time, initial concentration, and pH. The results of the study showed that adsorption of chromium by γ-alumina nanoparticles reached equilibrium after 60 min and after that a little change of chromium removal efficiency was observed. Furthermore, kinetics of chromium sorption was well fitted by pseudo-second order kinetic model, and well explained by the Freundlich isotherm (R2 > 0.992). Overall, alumina nanoparticles recognized as an effective sorbent to remove chromium(VI) from aqueous solutions.
    Źródło:
    Environment Protection Engineering; 2015, 41, 2; 133-145
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Regression modelling of air quality based on meteorological parameters and satellite data
    Autorzy:
    Asadi, A.
    Goharnejad, H.
    Niri, M.Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/14418.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
    Źródło:
    Journal of Elementology; 2019, 24, 1
    1644-2296
    Pojawia się w:
    Journal of Elementology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Efficient nitrate adsorption from water by aluminum powder. Kinetic, equilibrium and influence of anion competition studies
    Autorzy:
    Fakhri, Y.
    Kakavandi, B.
    Safaei, Z.
    Asadi, A.
    Mohseni, S. M.
    Golestanifar, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/208008.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    aluminium compounds
    kinetic parameters
    kinetic theory
    negative ions
    nitrates
    nitrogen removal
    particle size
    związki glinu
    parametry kinetyczne
    teoria kinetyczna
    jony ujemne
    azotany
    usuwanie azotu
    rozmiar cząstek
    Opis:
    The feasibility of aluminum powder (with particle size of 75–150 μm) for nitrate removal from aqueous solutions has been investigated. Adsorption was examined in function of initial nitrate concentration, contact time, pH and influence of other interfering anions. Maximum nitrate removal occurred at equilibrium pH of 10. The kinetics of adsorption of nitrate ions was discussed based on three kinetic models, namely: the pseudo-first order, the pseudo-second order and the intraparticle diffusion model. The experimental data fitted the pseudo-second order kinetic model very well; the rate constant was 4x10–4 g/ (mg·min) at the concentration of NO3- of 100 mg/dm3. The adsorption data followed both Langmuir (R2 = 0.808) and Freundlich (R2 = 0.865) isotherms probably due to the real heterogeneous nature of the surface sites involved in the nitrate uptake. The maximum sorption capacity of aluminum powder for nitrate adsorption was found to be ca. 45.2 mg/g at room temperature. The results indicate that aluminum powder is an interesting alternative for nitrate removal from the water.
    Źródło:
    Environment Protection Engineering; 2018, 44, 3; 19-31
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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